Last year in Maryland, the attorney general issued a scam alert targeting shoppers where a fake $100 bill is placed on car windshields, FOX 2 Now reported. When the vehicle’s driver gets out to collect the money, they are carjacked. The open door and key in the ignition are all thieves need to jump in and take off with the car.

It is now happening in St. Louis.

Kyri Viehman and her mother had left a Michaels store parking lot when they noticed something flapping on their windshields, according to FOX 2 Now.

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“I was driving down the road,” Viehman told FOX 2 Now. "I saw something flapping. Then I start driving and see the $100 on it and I was like, ‘Oh my God, somebody left me a $100 bill!’

Had Viehman noticed the fake bill while still in the parking lot, she may have been a victim of a carjacking.

“I probably would have got out and grabbed it ... with the car still running with my son in the back seat,” Viehman said.

“You leave the car running, open the door, walk over and grab the dollar bill and they jump in behind the wheel and take your car,” she noted about what she learned online about the scam.

Viehman shared her story with a picture of the fake $100 bill to Facebook. The post has been shared nearly 10,000 times, reported FOX 2 Now.

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“I thought somebody was paying it forward; somebody was like, ‘Hey [she] has a little boy,’” Viehman said. "'Here’s $100 bill. Have a good holiday.’”

The fake bills came with a message: "You thought this was real, didn't you?"

According to St. Louis County police, this is the first instance of the scam they have heard of in the area.